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Blocked Elements in 1-D and 2-D Arrays-Part II: Compensation Methods as Applied to Large Coherent Apertures.

Publication ,  Journal Article
Jakovljevic, M; Bottenus, N; Kuo, L; Kumar, S; Dahl, JJ; Trahey, GE
Published in: IEEE transactions on ultrasonics, ferroelectrics, and frequency control
June 2017

In Part I of this paper, we detected elements blocked by ribs during simulated and in vivo transcostal liver scans, and we turned those elements OFF to compensate for the loss in visibility of liver vasculature. Here, we apply blocked-element detection and adaptive compensation to large synthetic-aperture (SA) data collected through rib samples ex vivo, in order to reduce near-field clutter and to recover lateral resolution. To construct large synthetic transmit and receive apertures, we collected the individual-channel signals from a fully sampled matrix array at multiple and known array locations across the tissue samples. The blocked elements in SAs were detected using the method presented in Part I and retroactively turned OFF, while the subapertures covering intercostal spaces were either compounded, or coherently summed using uniform and adaptive element-weighting schemes. Turning OFF the blocked elements reduced the reverberation clutter by 5 dB on average. Adaptive weighing of the nonblocked elements to rescale the attenuated spatial frequencies reduced sidelobe levels by up to 5 dB for the transcostal acquisitions, and demonstrated a potential to restore lateral resolution to the nonblocked levels. In addition, the arrival-time surfaces were reconstructed to estimate the aberration from intercostal spaces and to offer further means to compensate for the loss of focus quality in transthoracic imaging.

Duke Scholars

Published In

IEEE transactions on ultrasonics, ferroelectrics, and frequency control

DOI

EISSN

1525-8955

ISSN

0885-3010

Publication Date

June 2017

Volume

64

Issue

6

Start / End Page

922 / 936

Related Subject Headings

  • Ultrasonography
  • Ribs
  • Phantoms, Imaging
  • Image Processing, Computer-Assisted
  • Humans
  • Dogs
  • Animals
  • Algorithms
  • Acoustics
  • 51 Physical sciences
 

Citation

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MLA
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Jakovljevic, M., Bottenus, N., Kuo, L., Kumar, S., Dahl, J. J., & Trahey, G. E. (2017). Blocked Elements in 1-D and 2-D Arrays-Part II: Compensation Methods as Applied to Large Coherent Apertures. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 64(6), 922–936. https://doi.org/10.1109/tuffc.2017.2683562
Jakovljevic, Marko, Nick Bottenus, Lily Kuo, Shalki Kumar, Jeremy J. Dahl, and Gregg E. Trahey. “Blocked Elements in 1-D and 2-D Arrays-Part II: Compensation Methods as Applied to Large Coherent Apertures.IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 64, no. 6 (June 2017): 922–36. https://doi.org/10.1109/tuffc.2017.2683562.
Jakovljevic M, Bottenus N, Kuo L, Kumar S, Dahl JJ, Trahey GE. Blocked Elements in 1-D and 2-D Arrays-Part II: Compensation Methods as Applied to Large Coherent Apertures. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2017 Jun;64(6):922–36.
Jakovljevic, Marko, et al. “Blocked Elements in 1-D and 2-D Arrays-Part II: Compensation Methods as Applied to Large Coherent Apertures.IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 64, no. 6, June 2017, pp. 922–36. Epmc, doi:10.1109/tuffc.2017.2683562.
Jakovljevic M, Bottenus N, Kuo L, Kumar S, Dahl JJ, Trahey GE. Blocked Elements in 1-D and 2-D Arrays-Part II: Compensation Methods as Applied to Large Coherent Apertures. IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 2017 Jun;64(6):922–936.

Published In

IEEE transactions on ultrasonics, ferroelectrics, and frequency control

DOI

EISSN

1525-8955

ISSN

0885-3010

Publication Date

June 2017

Volume

64

Issue

6

Start / End Page

922 / 936

Related Subject Headings

  • Ultrasonography
  • Ribs
  • Phantoms, Imaging
  • Image Processing, Computer-Assisted
  • Humans
  • Dogs
  • Animals
  • Algorithms
  • Acoustics
  • 51 Physical sciences